ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)

6 Months Ended

Jun. 30, 2020

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table summarizes the Company’s asset retirement obligations:

	June 30, 2020		December 31, 2019
Asset retirement obligation, beginning of period	$	18,972	$	19,104
Revision of estimate	—		(2,063		)
Accretion of liabilities	956		1,931
Asset retirement obligation, end of period	$	19,928	$	18,972
Asset retirement obligation:
Current	$	46	$	46
Non-current	19,882		18,926
Asset retirement obligation, end of period	$	19,928	$	18,972

Schedule of Restricted Cash and Cash Equivalents

The following table summarizes the Company’s restricted cash:

	June 30, 2020		December 31, 2019
Restricted cash, beginning of period	$	20,081	$	19,652
Additional collateral posted	188		429
Restricted cash, end of period	$	20,237	$	20,081

Cash, cash equivalents and restricted cash are included in the following accounts at June 30, 2020 and December 31, 2019:

	June 30, 2020		December 31, 2018
Cash and cash equivalents	$	26,635	$	12,810
Restricted cash included in other long-term assets	20,237		20,081
Total cash, cash equivalents and restricted cash	$	46,872	$	32,891